The Occurrence of Rocky Habitable-zone Planets around Solar-like Stars from Kepler Data

We present the occurrence rates for rocky planets in the habitable zones (HZs) of main-sequence dwarf stars based on the Kepler DR25 planet candidate catalog and Gaia-based stellar properties. We provide the first analysis in terms of star-dependent instellation flux, which allows us to track HZ planets. We define η⊕ as the HZ occurrence of planets with radii between 0.5 and 1.5 R⊕ orbiting stars with effective temperatures between 4800 and 6300 K. We find that η⊕ for the conservative HZ is between 0.37^(+0.48)_(−0.21) (errors reflect 68% credible intervals) and 0.60^(+0.90)_(−0.36) planets per star, while the optimistic HZ occurrence is between 0.58^(+0.73)_(−0.33) and 0.88^(+1.28)_(−0.51) planets per star. These bounds reflect two extreme assumptions about the extrapolation of completeness beyond orbital periods where DR25 completeness data are available. The large uncertainties are due to the small number of detected small HZ planets. We find similar occurrence rates between using Poisson likelihood Bayesian analysis and using Approximate Bayesian Computation. Our results are corrected for catalog completeness and reliability. Both completeness and the planet occurrence rate are dependent on stellar effective temperature. We also present occurrence rates for various stellar populations and planet size ranges. We estimate with 95% confidence that, on average, the nearest HZ planet around G and K dwarfs is ~6 pc away and there are ~4 HZ rocky planets around G and K dwarfs within 10 pc of the Sun

The Occurrence of Rocky Habitable Zone Planets Around Solar-Like Stars from Kepler Data

We present occurrence rates for rocky planets in the habitable zones (HZ) of main-sequence dwarf stars based on the Kepler DR25 planet candidate catalog and Gaia-based stellar properties. We provide the first analysis in terms of star-dependent instellation flux, which allows us to track HZ planets. We define $\eta_\oplus$ as the HZ occurrence of planets with radius between 0.5 and 1.5 $R_\oplus$ orbiting stars with effective temperatures between 4800 K and 6300 K. We find that $\eta_\oplus$ for the conservative HZ is between $0.37^{+0.48}_{-0.21}$ (errors reflect 68\% credible intervals) and $0.60^{+0.90}_{-0.36}$ planets per star, while the optimistic HZ occurrence is between $0.58^{+0.73}_{-0.33}$ and $0.88^{+1.28}_{-0.51}$ planets per star. These bounds reflect two extreme assumptions about the extrapolation of completeness beyond orbital periods where DR25 completeness data are available. The large uncertainties are due to the small number of detected small HZ planets. We find similar occurrence rates using both a Poisson likelihood Bayesian analysis and Approximate Bayesian Computation. Our results are corrected for catalog completeness and reliability. Both completeness and the planet occurrence rate are dependent on stellar effective temperature. We also present occurrence rates for various stellar populations and planet size ranges. We estimate with $95\%$ confidence that, on average, the nearest HZ planet around G and K dwarfs is about 6 pc away, and there are about 4 HZ rocky planets around G and K dwarfs within 10 pc of the Sun.Comment: To appear in The Astronomical Journa

Medical Towers-171711th Ave. S. Birmingham, AL 35294)/ and a doctoral candidate in the Department of Health Behavior

Native American populations in North America are at increased risk of a variety of health problems, including (but not limited to) diabetes. This risk is presumed to be a result of the interaction of environmental influences with a population genetic susceptibility. Anthropologists have subsumed those environmental influences under the term "acculturation." Here, we break that broad concept into physical, behavioral, and sociocultural components in an examination of the correlates of arterial blood pressure and plasma glucose among the Mississippi Choctaw. In a sample of 93 adults, higher plasma glucose was associated with lower physical activity, higher body mass index, and higher lifestyle incongruity, after controlling for age, sex, and recency of food consumption. Higher arterial blood pressure was associated with higher body mass index and being single. These results suggest that the risk of disordered glucose metabolism within this Native American population is associated with acculturation broadly construed, but that refined models of health and disease must take into account the multiple dimensions of this concept. Physical, behavioral, and sociocultural factors combine to describe more precisely the concept of acculturation, and hence the factors contributing to the risk of disease in Native American communities. Key words: Health status, Choctaw Indians, Sociocultural factors Native Americans are at increased risk of a variety of acute and chroni~health problems. With respect to chronic health problems, high rates of non-insulin dependent diabetes mellitus have been observed among some Native American Indian populations, ranging from an approximate 8% prevalence~mong the Dogrib of the Canadian Northvvest Territories, to nearly 25% among the Pima of Arizona; corresponding prevalence rates for non-Hispanic whites range from 2-4% (Weiss, Ulbrect, Cavanaugh, and Buchanan 1989). High rates of diabetes, representing an outcome of disordered glucose metabolism, pose questions about the adaptation of human populations that have stimulated considerable attention from biological anthropologists. 9ur aim is much more limited. Thi

Neighborhood characteristics favorable to outdoor physical activity: Disparities by socioeconomic and racial/ethnic composition

Abstract available at publisher's web site

Formative research methods to understand patient and provider responses to heart attack symptoms

Formative research is often required for program planning, and for reducing uncertainty about generalizability of program effects. This article describes and justifies methods of formative research conducted for the REACT study (Rapid Early Action for Coronary Treatment), a multi-center collaborative randomized community trial aimed at reducing patient delay in seeking care for acute myocardial infarction (AMI). Formative research cast light on the decision-making process of patient and community members in seeking help for AMI, as well as barriers and facilitators of this process. Investigators at all five REACT Field Centers participated in the formative research. The process consisted of: (1) developing a common theoretical framework for the study intervention; (2) conducting a literature review and qualitative research to identify and address gaps in knowledge; and (3) developing a common protocol for the REACT study that accommodated the diversity of the target communities in terms of services, resources, history, and ethnicity. Analysis employed triangulation, defined as an explicit search for heterogeneous data sources to reduce uncertainty about forces at work and opportunities for intervention across settings and populations. Because the collection and interpretation of data went in stages, staff of several REACT Field Centers had independent input to the overall synthesis, then shared and revised the results. Advantages and limitations of this approach are discussed

The association of individual and school factors with female BMI in the Healthy Passages cohort.

<p>^` Ref = Reference group; sigma_u is the standard deviation of the school-level random effect; sigma_e is the standard deviation of the individual-level random effect.</p>a<p>High school levels categorized into some high school, high school graduate or received GED, some college, and college graduate or beyond.</p>b<p>School nutrition/physical activity index is a count of the positive nutrition and physical activity resources/programs reported in the school.</p